Molded commutator cylinder.



C. E. WILSON W. H/KEMPTON & A. J. BASTIAN.

MOLDED COMMUTATOR CYLINDER.

APPLICATION FILED ocT. 8, 1917. RENEWED OCT-2.1918- 1 ,284,524:. Patented Nov. 12, 1918v 4 Z z z Z WITNESSES: INVEN'L'CRS a. ym l u'l-fifr'fkwfli'ion and 7 A'L'TORNEY UNITED srnrns CHARLES E. WILSON AND WILLARD H. KEIVIPTON, F WILKINSBURG, AND ARTHUR d. BASTIAN, OF EDGEWOOD PARK, PENNSYLVANIA, ASSIGNORS T0 WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATIGN 01F PENNSYLVANIA.

MOLDED GQMMUTATOR CYLENDEI-t.

Specification of "Letters Patent.

rateneeu'nov. re, tors.

Application filed October 8, 191?, Serial No. 195,282. Renewed October 2, 1918. Serial No. 256,630.

To all whom it may concern:

Be it known that we, CHARLES E. WrLsoN,

. of Allegheny and State of Pennsylvania,

and ARTHUR J. BAs'rrAN, a citizen of the United States, and a resident of Edgewood -Park, in the county of Allegheny and State of Pennsylvania, have invented a new and useful lmprovement in Molded Commutator-Cylinders, of which the following is a specification.

Our invention relates to commutator cyl inders for dynamo-electric machines and to other structures in which the assembled cone ducting and other parts are held in position by molded insulating material.

The obiect of our invention is to provide a commutator cylinder or other structure of the character designated which shall embody means for materially increasing the mechanical strength of the section of molded insulating material.

lln co-pending application of Willard lil. Kem ton. Serial No; 5899. filed February 3. 1915, and assigned to the Westinghouse Electric & lllanutacturing Co... is shown a moldcd commutator cylinder that is provided with rigid strengthening rings. embedded invthe molded insulating material in such a manner as to increase the strength of the molded section. Rigid insulating rings are dililcult to pos t on during the molding operation and are liable to become displaced. Moreo er. the render it diiiicu t to "Force the mo ded insulating material into the crevices. Metal rings have been emnloved in some cases in order to give the desired mechanical strength but it has been found that such rings are liable to come in contactwith the conducting sections and short circuit them when embodied in commutator cylinders of small diameter.

lily our invention, we provide a novel "form of strengthening ring composed of non-conducting material which possesses the reouired mechanical strength and may be readily applied.

Referring to the accompanying drawing, the single figure is a cross sectional view of a commutator constructed in accordance with our invention.

.lteferring more particularly to the drawing, alternate conducting and insulating sections 1 and 2, respectively, are arranged in annular form, with portions thereof embedded in molded insulating material 3, that is supported upon a hollow cylindrical sleeve 4:, by means of which the commutator cylinder is attached to the shaft (not shown).

lhe conducting and insulating sections it and 2 are respectively provided with end notches that register with each-other to form annular grooves 5. Rings 6, that are composed of strong cord impregnated with bakelite Or some other suitable insulating material and molded to form a substantially unitary body are located inthe grooves 5. The rings 6 serve to materially increase the tensile strength of the section of insulating material 3 and are well adapted to withstand stresses tending to distort them without breaking or cracking because, being composed of fibrous stranded material, they are capable of yielding slightly under pressure.

On account of the strengthening rings in our invention being formed of cord or tabric impregnated with insulating material. it will be impossible for the conducting sections to be short circuited thereby. Furthermore. such commutator cylinders may be readily molded. as no great care need be exerc sed in positioning the rings.

While we have shown our invention as applied to a commutator cylinder. it Wlll be obvious to those skilled in the art that it is rial disposed in said notches-and embedded .in the molded insulating material.

2. A commutator structure comprising a lltlti with notches alined to form an annular groove, a body of molded insulating material located Within said cylinder, and a strengthening ring composed of flexible corded material embedded in said molded insulating material and extending into said groove. i

4:. A commutator structure comprising a plurality of alternating conducting and insulating sections arranged to form a hollow cylinder, the said sections being provided with notches alined to form an annular groove, a body of molded insulating material located within said cylinder, and a strengthening ring composed of stranded fibrous material held together by an insulatingbihder and embedded in said molded insulating material and extending into said groove,

5. commutator structure comprising a plurality of alternating conducting and insulating sections arranged to form a hollow cylinder. the said sections being "provided with notches alined to form an annular groove, a body of molded insulating mate rial located within said cylinder, and a strengthening ring composed of cord impregnated with a phenolic condensation product and embedded in said molded insulating material and extending into said groove.

6. A commutator structure comprising a plurality of alternating conducting and insulating sections arranged to form a hollow cylinder, the said sections being provided with notches alined to form an annular groove, a body of molded insulating material located within said cylinder, and a strengthening ring composed of stranded fibrous material impregnated with an insulating compound and molded so as to conform to the shape of said groove and embedded in said molded insulating material.

7. A composite article comprising bodies of conducting material, a body of molded insulating material for holding said bodies in place, and a reinforcing member comprising stranded fibrous-material embedded in said molded insulating material.

8. A composite article comprising bodies of conducting material, a body of molded insulating material for holding said bodies in place, and a reinforcing member comprising stranded fibrous material impregnated with an insulating compound and embedded in said molded insulating material.

Intestimony whereof, we have hereunto subscribed our names this 29th day of September 1917.

CHARLES E. wILsoN. WILLARD H. KEMPTON. ARTHUR J. BASTIAN. 

